So i was searched on the Minecraft Wiki, and theres this thing called Minecraft Dungeons Arcade. So now the Obsidian Monstrosity is offically a boss! (Not fake, you can search it, link

Minecraft Dungeons:Redstone Monstrosity – Minecraft Wiki

Minecraft Dungeons:Redstone Monstrosity – Minecraft Wiki

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Minecraft Dungeons:Boss – Minecraft Wiki

The Quest To Defeat The Obsidian Monstrosity - Minecraft Dungeons

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Minecraft Dungeons:Redstone Monstrosity – Minecraft Wiki

Lost arcade game “Miner's Revenge”, looking for any gameplay

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Inventory – Minecraft Wiki

Minecraft Dungeons Arcade – Minecraft Wiki

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